Lei Yang is VP of Engineering at Quora where she currently leads all engineering teams. Prior to this, she led and managed the feed ranking and content distribution team, and oversaw Quora's machine learning engineers guild. Before joining Quora, Lei grew and managed several engineering teams at Google such as the Google Now recommendations, Google+ personalization, and Google Ads Quality teams. She has 10 years of experience in machine learning and is passionate about its application across different fields, such as data mining, personalization, content recommendation, and spam detection. Lei holds a Ph.D. degree in Computer Engineering from Northwestern University.